CVE-2026-6681

Medium

Description

The PKCS#7 decode path ignores the caller-supplied output buffer size (outputSz), allowing decoded content to be written past the bounds of the provided buffer. This affects wolfSSL 5.9.0 and earlier and was fixed in the 5.9.1 release.

SeverityMedium

CVSS5.3

Exploit probability—

ProductWolfssl

PublishedJun 25, 2026

First seenJun 25, 2026

Weakness typeCWE-787Out-of-bounds write CWE-120CWE-120

How to fix

Update

wolfssl wolfssl5.9.1 or later

Patches

github.com/wolfSSL/wolfssl/pull/10116

Affected products

Product	Affected versions	Fixed in
wolfssl wolfssl	3.10.0 ≤ v < 5.9.1	5.9.1

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